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NSW experts have seized more than 20 kilograms of black powder, nearly 5000 detonators and more than 2000 metres of detonating cord.

One person at Barraba, in the state's New England region, handed in 38 sticks of Powergel - an emulsion explosive commonly used in tunnelling - while another person near Ivanhoe in the west surrendered 20kg of the same material.

Homemade explosives are also among the haul.

The amnesty allows those with illegal material to surrender it without prosecution.

It will end at midnight on Thursday, but as long as residents have contacted police before it closes, they will be covered by the amnesty.